EP0327242A1 - I.S.-Glasformmaschine - Google Patents

I.S.-Glasformmaschine Download PDF

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Publication number
EP0327242A1
EP0327242A1 EP89300644A EP89300644A EP0327242A1 EP 0327242 A1 EP0327242 A1 EP 0327242A1 EP 89300644 A EP89300644 A EP 89300644A EP 89300644 A EP89300644 A EP 89300644A EP 0327242 A1 EP0327242 A1 EP 0327242A1
Authority
EP
European Patent Office
Prior art keywords
plunger
parison
parison formation
formation point
plungers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89300644A
Other languages
English (en)
French (fr)
Other versions
EP0327242B1 (de
Inventor
Steven James Pinkerton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Emhart Glass Machinery Investments Inc
Original Assignee
Emhart Industries Inc
Emhart Glass Machinery Investments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Emhart Industries Inc, Emhart Glass Machinery Investments Inc filed Critical Emhart Industries Inc
Publication of EP0327242A1 publication Critical patent/EP0327242A1/de
Application granted granted Critical
Publication of EP0327242B1 publication Critical patent/EP0327242B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B9/00—Blowing glass; Production of hollow glass articles
    • C03B9/13—Blowing glass; Production of hollow glass articles in gob feeder machines
    • C03B9/193—Blowing glass; Production of hollow glass articles in gob feeder machines in "press-and-blow" machines
    • C03B9/1932—Details of such machines, e.g. plungers or plunger mechanisms for the press-and-blow machine, cooling of plungers
    • C03B9/1938—Electrical means for the displacement of the plunger
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B9/00—Blowing glass; Production of hollow glass articles
    • C03B9/13—Blowing glass; Production of hollow glass articles in gob feeder machines
    • C03B9/193—Blowing glass; Production of hollow glass articles in gob feeder machines in "press-and-blow" machines
    • C03B9/1932—Details of such machines, e.g. plungers or plunger mechanisms for the press-and-blow machine, cooling of plungers
    • C03B9/1936—Hydraulic or pneumatic displacement means of the plunger
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B9/00—Blowing glass; Production of hollow glass articles
    • C03B9/30—Details of blowing glass; Use of materials for the moulds
    • C03B9/40—Gearing or controlling mechanisms specially adapted for glass-blowing machines
    • C03B9/41—Electric or electronic systems

Definitions

  • the present invention relates to the simultaneous forming of gobs of molten glass into parisons in a multi-gob, individual section, glass forming machine.
  • a glassware forming machine of the individual section, multi-gob type has a number of individual sections each having a selected number (usually 2, 3 or 4) of parison mold assemblies 10 for simultaneously forming a corresponding number of parisons.
  • Each of these mold assemblies 10 includes two mold halves 11 which are movable between an advanced position where they engage one another and other parts of the mold assembly to form a mold cavity 12 and a retracted position where the mold halves 11 are spaced to permit removal of a formed parison.
  • a neck ring 14 cooperates with the mold halves 11 to define the cavity 12 and is arranged to grip the neck portion of a formed parison so that the parison can be transferred from the mold cavity to a blow mold.
  • a baffle 16, movable into a position on top of the engaging mold halves 11, defines the upper surface of the mold cavity and is moved to a remote location prior to parison removal.
  • Each mold assembly also has a plunger mechanism including a plunger 20.
  • the plunger 20 is first moved from its out-of-the-way position to its intermediate position where the plunger projects upwardly into the mold cavity.
  • a gob of molten glass is dropped into the mold cavity 12 and rests on the plunger 20.
  • the plunger is then advanced under a constant feed pressure from this intermediate position to press the glass against the walls of the cavity 12 to form the parison.
  • Figure 1 the plunger is shown during its advancement from the intermediate position to its fully advanced position.
  • the plunger is then retracted to its intermediate position by cutting the feed pressure and applying a retract pressure and then retracted from the intermediate position to the out-of-the-way position to allow for removal of the parison.
  • the plunger mechanism also has a cylinder 30, a piston 32 movable in the cylinder 30, and a piston rod 34 projecting from the piston 32 through a seal 36 in an upper end cap 38 of the cylinder 30.
  • the plunger 20 is mounted on an upper end portion of the piston rod 34 by a clamping ring 40. Pressurized hydraulic fluid introduced into the cylinder 30 through an upper entry port 42 causes the piston 32 to move downwards in the cylinder 30, and the introduction of the fluid through port 44 causes the piston 32 to move upwardly in the cylinder 30.
  • each parison mold assembly also has a Plunger Displacement Mechanism (a valving arrangement which can alternately apply the feed and retract pressures to the appropriate cylinder ports 42, 44).
  • the time when each pressure is applied is defined by a Plunger Displacement Starter and the other control parameters such as duration of application are controlled by a Plunger Controller (the plunger controllers are a part of the Individual Section Machine Control).
  • each Parison Mold Assembly includes a Displacement Probe Assembly having a linear potentiometer 50 ( Figure 1) secured to the plunger housing 30. As a plunger is displaced through this 3/8", the piston 32 of that plunger will engage and displace a probe 52 to which is secured the potentiometer wiper 54. The displacement of this wiper 54 along the potentiometer element 56 changes the output of the linear potentiometer.
  • Figure 3 illustrates a plot of plunger displacement (voltage), as sensed by the probe, versus time, zero seconds being when the Plunger Displacement Starter commences plunger displacement (fires "plunger-up" solenoid, for example).
  • This plot reveals a linear or constant velocity region between points A and B. Since the pressure is constant during this plunger advancement, the force exerted on the glass by the plunger remains constant. It is believed that point A is the point where the mold cavity has completely filled (the parison formation point) and that from point A to point B, the glass is cooling, and hence, shrinking.
  • Point B corresponds to the time when the Plunger Controller commences plunger retraction (fires "plunger-down" solenoid, for example).
  • the parison has a specific temperature T (see Figure 4). Accordingly, if one plunger reaches Point A behind schedule (A1 or A2), that parison will cool for a shorter period of time and the parison temperature (T1 or T2) will be higher than the temperature T of the third parison that has cooled from point A.
  • Point A is the time when all the parisons should be formed if they are all to cool to the desired temperature T when the plunger is retracted at Point (time) B. This also assumes that all three parisons cool at the same rate.
  • the Plunger Controller for each plunger which receives positional data from its associsted Displacement Probe Assembly determines when Point A has been reached (has determined that the displacement curve has become linear), and supplies this data to a Synchronization Offset Generator which determines the time differences between the three Position A Signals.
  • the Synchronization Offset Generator then supplies time offsets (negative) to the Start Time Offset for the Plunger Controllers for the two plungers which arrived at their Point A after the third plunger arrived at its Point A. These offsets accordingly synchronize the plungers (assure that all three plungers reach the parison formation point at the same time). These offsets are updated every cycle to adjust for pressure or other variations.
  • the slope of the section from Point A to Point B may not, however, be the same for all of the parison mold assemblies.
  • the slope of this section may be AB for an outer mold and AB1 for the middle mold.
  • the temperature T of the outer parisons will accordingly be less than the temperature T1 of the middle parison.
  • "A offsets" can be selectively programmed via suitable thumb wheel switches 60.
  • the feed cycle for this middle plunger can accordingly be advanced relative to the outer mold so that this section will conform to section A1B, rather than section AB1, and hence, will cool to temperature T rather than to temperature T1.
  • the Synchronization Offset Generator compares signals (Point X Signals), which should arrive at the same time. These signals will be Point A Signals when no A Offsets have been defined. As a result, A offsets can be set without altering the operation of the Synchronization Offset Generator.
  • the Synchronization Offset Generator includes Position X readouts 62, which in a manual system, can be relied on by an operator to define the Offsets which can be inputted into the start time offsets via conventional thumb wheel switches or the like 64.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
EP89300644A 1988-02-05 1989-01-24 I.S.-Glasformmaschine Expired EP0327242B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US152694 1988-02-05
US07/152,694 US4786306A (en) 1988-02-05 1988-02-05 Individual section glass forming machine

Publications (2)

Publication Number Publication Date
EP0327242A1 true EP0327242A1 (de) 1989-08-09
EP0327242B1 EP0327242B1 (de) 1992-05-20

Family

ID=22544006

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89300644A Expired EP0327242B1 (de) 1988-02-05 1989-01-24 I.S.-Glasformmaschine

Country Status (4)

Country Link
US (1) US4786306A (de)
EP (1) EP0327242B1 (de)
JP (1) JP2650750B2 (de)
DE (1) DE68901539D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9608039D0 (en) * 1996-04-18 1996-06-19 Emhart Glass Mach Invest Plunger assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3151521A1 (de) * 1981-12-24 1983-07-14 Veba-Glas Ag, 4300 Essen "verfahren und vorrichtung zur herstellung von hohlglasartikeln"
DE3248266A1 (de) * 1982-12-28 1984-06-28 Veba-Glas Ag, 4300 Essen Verfahren zum verpressen von glastropfen in glasverarbeitungsmaschinen
US4613352A (en) * 1984-01-18 1986-09-23 Hermann Heye Displacement pick-up arrangement for the position detection of a pressing plunger
US4662923A (en) * 1984-06-06 1987-05-05 Emhart Industries, Inc. Forming a gob of molten glass into a parison

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2702444A (en) * 1949-07-09 1955-02-22 Emhart Mfg Co Apparatus for forming glassware
US3323891A (en) * 1966-08-17 1967-06-06 Maul Bros Inc Glass forming apparatus with selfaccommodating and universal plungers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3151521A1 (de) * 1981-12-24 1983-07-14 Veba-Glas Ag, 4300 Essen "verfahren und vorrichtung zur herstellung von hohlglasartikeln"
DE3248266A1 (de) * 1982-12-28 1984-06-28 Veba-Glas Ag, 4300 Essen Verfahren zum verpressen von glastropfen in glasverarbeitungsmaschinen
US4613352A (en) * 1984-01-18 1986-09-23 Hermann Heye Displacement pick-up arrangement for the position detection of a pressing plunger
US4662923A (en) * 1984-06-06 1987-05-05 Emhart Industries, Inc. Forming a gob of molten glass into a parison

Also Published As

Publication number Publication date
EP0327242B1 (de) 1992-05-20
JP2650750B2 (ja) 1997-09-03
US4786306A (en) 1988-11-22
JPH01308838A (ja) 1989-12-13
DE68901539D1 (de) 1992-06-25

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